$ sudo systemctl stop apprt.service
[ ok ] Stopped Application Runtime
$ ./upgrade.sh --node edge-04 --release 7.2.1
→ draining connections... done (412 → 0 in 38s)
→ snapshot taken: snap-2026-06-15-0117
→ applying firmware blob (12.4 MB)... ok
→ swapping kernel image 5.15.119 → 5.15.140-lts
→ rebooting host
[2026-06-15 01:24:02] host returned from reboot (uptime 0d 0h 0m 22s)
→ running smoke tests............................
   pass http-204 on /healthz
   pass postgres replication lag 0 ms
   pass nats publish/subscribe round-trip 1.4 ms
   pass tls handshake (ja3/ja4)
→ waiting for cluster quorum
# service unavailable while node rejoins the ring
# resumes once quorum > 2/3, expected within ~6 min